CN110686359B - Fault diagnosis method for variable frequency air conditioner - Google Patents
Fault diagnosis method for variable frequency air conditioner Download PDFInfo
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- CN110686359B CN110686359B CN201810738545.0A CN201810738545A CN110686359B CN 110686359 B CN110686359 B CN 110686359B CN 201810738545 A CN201810738545 A CN 201810738545A CN 110686359 B CN110686359 B CN 110686359B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The fault diagnosis method for the inverter air conditioner comprises the following steps: powering on the air conditioner; the detection tool detects and determines one of the indoor unit and the outdoor unit as a main device and the other one as a slave device; if the detection tool receives command data sent by the master device, the command data are forwarded to the slave device, and if response data fed back by the slave device are not received within a first effective preset value, the communication fault of the slave device is judged; if the received response data fed back from the equipment is within the first effective preset value, judging that the communication is normal; and if the detection tool does not receive the command data sent by the master equipment, sending test data to the slave equipment, and if response data fed back by the slave equipment are received within a second effective preset value, determining that the master equipment has a communication fault. The invention has the advantages of good universality and high intelligent degree.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a fault diagnosis method for a variable frequency air conditioner.
Background
The communication fault of the variable frequency air conditioner is a common circuit fault, when a communication circuit part has a fault, various control instructions of the air conditioner cannot be transmitted, and various functions of the air conditioner cannot be normally completed. The direct embodiment of the communication circuit fault comprises the following steps: the whole air conditioner cannot be started, the outdoor unit does not work, and the whole air conditioner is protected when the air conditioner is started. In the prior art, the inverter air conditioner generally has a fault code display, and once a communication circuit has a fault, the air conditioner can display a corresponding fault code. However, in actual maintenance, it is not easy to directly find out a specific failure point by simply relying on a failure code, and when a code indicating a communication failure occurs in the air conditioner is displayed, it can be determined that the communication circuit is abnormal only in a general manner. Maintenance personnel confirm concrete fault point through detection circuitry parameter or change the standby circuit board that has similar communication interface, have not only increased the maintenance cost, and maintenance efficiency is also lower.
Disclosure of Invention
The invention provides a fault diagnosis method for a variable frequency air conditioner, and aims to solve the problems of high maintenance cost and low efficiency when a communication fault is determined by detecting circuit parameters or replacing a standby circuit board with a similar communication interface in the prior art.
The invention provides a fault diagnosis method for a variable frequency air conditioner, which comprises the following steps:
the indoor unit is powered on and the relay is closed, and the air conditioner is powered on;
the detection tool detects and determines one of the indoor unit and the outdoor unit as a main device and the other one as a slave device;
if the detection tool receives command data sent by the master device, the received command data are forwarded to the slave device, meanwhile, a first timer in the detection tool starts timing, and if the first timer is at a first effective preset value T of the first timer1If the response data fed back by the slave equipment is not received, the communication fault of the slave equipment is judged; if at the first valid preset value T of the first timer1If response data fed back by the slave equipment is received, judging that the communication is normal;
if the detection tool does not receive command data sent by the master equipment, sending test data to the slave equipment, detecting a first timer in the tool to start timing, and if the first timer is at a second effective preset value T of the first timer2And if response data fed back by the slave equipment is received, judging that the communication fault of the master equipment exists.
Further, when detecting the frock and detecting and confirming the master slaver of indoor set and off-premises station includes:
when the air conditioner is electrified, a second timer in the detection tool starts timing:
A. if the first verification preset value T of the second timer is reachedt1If the detection tool receives authentication data sent by the indoor unit or receives authentication data sent by the outdoor unit, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
B. if the second verification preset value T of the second timer is reachedt2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the indoor unit is judged to be the slave unit, the outdoor unit is judged to be the master unit, and T ist2 > Tt1。
Further, step a comprises:
presetting a value T in the verification period of the second timert3In the detection tool, a microprocessor monitors whether a first communication interface receives authentication data sent by an indoor unit, wherein T ist3< Tt1：
If the preset value T is set in the verification periodt3If the authentication data sent by the indoor unit is received, the indoor unit is judged to be a master device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
if the preset value T is set in the verification periodt3If the identity verification data fed back by the outdoor unit is received, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the identity verification data.
Further, if it is determined that the indoor unit is the master device and the outdoor unit is the slave device according to the authentication data received by the first communication interface, the fault diagnosis includes:
the microprocessor of the detection tool forwards the command data received from the first communication interface to the outdoor unit through the second communication interface, if the command data is in the second communication interfaceAn effective default value T1If response data fed back by the outdoor unit are not received, the outdoor unit is judged to be in fault, and the detection tool displays a corresponding fault code;
if at the first valid preset value T1And if response data fed back outdoors are received, judging that the communication is normal, and displaying a corresponding communication code by the detection tool.
Further, if it is determined that the indoor unit is the master device and the outdoor unit is the slave device according to the authentication data received by the second communication interface, the fault diagnosis includes:
the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface, and if the test data is at a second effective preset value T2If response data fed back by the outdoor unit is received, the preset time T of the fault is reached in timings1And displaying the communication code of the communication fault of the indoor unit.
Further, if it is determined that the outdoor unit is the master and the indoor unit is the slave, the fault diagnosis includes:
the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit:
C. if the command data are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors a first effective preset value T of the first communication interface in the first timer1Whether response data fed back by the indoor unit is received or not is judged, if the response data are received, the communication is judged to be normal, if the response data are not received, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed;
D. if the command data are not received, the microprocessor of the detection tool generates test data and sends the test data to the indoor unit through the first communication interface, and monitors the first effective preset value T of the first communication interface in the first timer1And if the response data is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the communication fault of the outdoor unit.
Further, in step C, the second stepAn effective default value T1Comprises at least one first preset period Tp1Detecting the microprocessor of the tool in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And if the response data fed back by the indoor unit are not received, judging that the communication fault of the indoor unit occurs.
Further, in step C, the first valid preset value T1Comprises four first preset periods Tp1Four predetermined periods Tp1Is less than a first valid preset value T1(ii) a Detecting the microprocessor of the tool in each first preset period Tp1Forwarding the command data to the indoor unit once and monitoring the first communication interface at each first preset period Tp1Whether response data fed back by the indoor unit is received; if any one of the first preset periods Tp1If response data fed back by the indoor unit are received, command data are stopped being forwarded; if the response data are not received, the communication fault of the indoor unit is judged, and meanwhile, the microprocessor of the detection tool outputs a starting control signal to the outdoor unit through the second communication interface to drive the outdoor unit to start and keep a working state.
Further, in step D, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, determines whether the indoor unit executes an action corresponding to the setting command signal, and if the indoor unit does not respond, determines that the indoor unit has a communication fault and displays a communication code of the communication fault of the indoor unit.
Further, in step D, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and sets a second preset period T for each setp2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, the indoor unit communication fault is judged and displayedA communication code; t isp2> Tp1。
By the method, when the air conditioner has a communication fault code, the fault point can be automatically determined by the method, and a maintenance worker does not need to replace a standby circuit board with a similar communication interface to determine the fault point. Meanwhile, the diagnosis method can automatically detect, identify and determine the master-slave identities in the communication between the indoor unit and the outdoor unit, so that the diagnosis method can be applied to various types of machines, has good universality and high intelligent degree, does not need maintenance personnel to carry or obtain the specific information of communication protocols of various types of machines, reduces the working difficulty of the maintenance personnel, reduces the maintenance cost and improves the maintenance efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for diagnosing faults of an inverter air conditioner according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an exemplary embodiment of a method for diagnosing faults of an inverter air conditioner according to the present invention, wherein the method includes detecting the identities of an indoor unit and an outdoor unit by a detection tool;
fig. 3 is a flowchart of another specific embodiment of detecting the tool and determining the master-slave identities of the indoor unit and the outdoor unit in the fault diagnosis method for the inverter air conditioner disclosed by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a method for diagnosing a fault of an inverter air conditioner according to an embodiment of the present invention. As shown in the figure, the present embodiment specifically includes the following steps:
and step S101, the power supply of the indoor unit of the split air conditioner is conducted, and the indoor unit receives a starting control signal output by a remote controller, a mobile terminal or other matched intelligent equipment. After receiving the starting control signal, the indoor unit mainboard outputs an electric signal to control the suction of a power-on relay in the indoor unit and power on the air conditioner.
And the indoor unit main board and the outdoor unit main board are respectively provided with a group of communication circuits. After the air conditioner is powered on, if the communication circuits on the indoor unit mainboard and the outdoor unit mainboard are normal, the indoor unit mainboard and the outdoor unit mainboard can automatically communicate, the respective circuit conditions are sent to the opposite side in a pulse sequence mode according to a set communication rule, and after the opposite side receives normal information, the indoor unit circuit and the outdoor unit circuit are both in a standby state so as to further execute the air conditioning action. In order to diagnose a communication fault, a set of normal indoor unit communication circuit and normal outdoor unit communication circuit are configured in the method for diagnosing a fault of an inverter air conditioner disclosed in this embodiment. The normal indoor unit communication circuit and the outdoor unit communication circuit are preferably integrated in one detection tool, and signal circuits between the indoor unit communication circuit and the outdoor unit communication circuit are conducted, so that normal communication can be achieved. The signal receiving and sending of the indoor unit communication circuit and the outdoor unit communication circuit are controlled by a microprocessor of the detection tool. The microprocessor of the detection tool can be a single chip microcomputer or other integrated circuits, chips and peripheral circuits thereof which can realize the same functions.
The communication flow of the traditional inverter air conditioner can be divided into the following two types: 1, an indoor unit mainboard generates a communication signal, the signal is transmitted to an outdoor unit mainboard through a communication circuit, and meanwhile, the communication signal fed back by an outdoor unit mainboard CPU is received and processed; or 2, the outdoor unit mainboard generates a communication signal, the signal is transmitted to the indoor unit mainboard through the communication circuit, and meanwhile, the communication signal fed back by the indoor unit mainboard CPU is received and processed. The former is commonly used in a split-type air conditioner, and the latter is commonly used in a multi-split air conditioner. And different communication modes and communication protocols can be adopted according to different models of the air conditioner. Therefore, in the fault diagnosis process, as shown in step S102 in fig. 1, the detection tool is first used to detect and distinguish the identities of the master device and the slave device of the indoor unit and the outdoor unit, so as to define the function types of the indoor unit and the outdoor unit in the fault diagnosis process, so that the data in the communication fault detection process has interoperability and interchangeability.
Step S103, during fault diagnosis, firstly, it is determined whether the detection tool receives command data sent by the master device.
Step S1041, if the detection tool receives the command data sent by the master device, forwarding the received command data to the slave device. Meanwhile, a first timer in the detection tool starts timing. The first timer may be a timing circuit integrated in the detection tool processor, or may be a timing circuit provided independently, which is not limited herein. The first timer is preset with a first effective preset value T1。
Step S1051, if the first valid preset value T of the first timer is reached1If the response signal fed back from the slave device is not received, it is determined that the slave device has a communication failure in step S1061. If the first valid preset value T of the first timer is reached1When response data fed back from the device is received, it is determined in step S1063 that the communication is normal. The command data and response data are preferably each comprised of 16 bytes, each byte being comprised of a set of 8-bit binary codes. When command data or response data is sent, a byte representing a start identification code is sent first, then data information of 1 st to 16 th bytes is sent in sequence, and finally an end identification code byte is sent until one communication is completed. First effective preset value T1The selection can be made within a range of values from 500ms to 2 min.
Similarly, in step S1042, if the detection tool does not receive the command data sent by the host device, the detection tool receives the command data sent by the host deviceActively sending test data to the slave device. The test data is stored in the microprocessor of the detection tool. The test data is also composed of 16 bytes, each byte is composed of a group of 8-bit binary codes, when the test data is sent, a byte representing the start identification code is sent firstly, then the data information of the 1 st to 16 th bytes is sent in sequence, and finally an end identification code byte is sent till one communication is completed. The data information includes, but is not limited to, one or more of model, operation mode, target frequency, port status, protection status, set temperature, detected temperature, rotation speed, and operation mode. And when the test data is actively sent to the slave equipment, a first timer in the detection tool starts timing. Step S1052, if the second valid preset value T of the first timer is reached2If the response data fed back from the slave device is received, it is determined that the master device has a communication failure in step S1062. Second effective preset value T2The selection can be made within a range of values from 500ms to 2 min.
By the method, when the air conditioner has a communication fault code, the fault point can be automatically determined by the method, and a maintenance worker does not need to replace a standby circuit board with a similar communication interface to determine the fault point. Meanwhile, the diagnosis method can automatically detect, identify and determine the master-slave identities in the communication between the indoor unit and the outdoor unit, so that the diagnosis method can be applied to fault detection of various types, has good universality and high intelligent degree, does not need maintenance personnel to carry or obtain specific information of communication protocols of various types, reduces the working difficulty of the maintenance personnel, reduces the maintenance cost and improves the maintenance efficiency.
In the embodiment of the invention, a method for detecting and determining master-slave identities of an indoor unit and an outdoor unit is further preferably disclosed. Specifically, the detection tool comprises the following steps of when detecting and determining the master-slave identities of the indoor unit and the outdoor unit:
as shown in fig. 2, in step S1021, the second timer in the detection tool starts to count time while the air conditioner is powered on. The second timer is preset with a first verification preset value Tt1And a second verification preset value Tt2。
Step A01, if the first verification preset value T of the second timer is reachedt1If the detection tool receives the authentication data sent by the indoor unit or the authentication data sent by the outdoor unit, in step a02, it is determined that the indoor unit is the master device and the outdoor unit is the slave device. And further in step a03, the detection tool determines the type of communication protocol according to the specific bytes in the authentication data.
Step B01, if the second verification preset value T of the second timer is reachedt2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the communication protocol circuit is switched in step B02, and it is determined that the indoor unit is the slave unit and the outdoor unit is the master unit in step B03, where T ist2 > Tt1。
For the detection tool, in order to be suitable for fault detection of a common split air conditioner and fault detection of a multi-split air conditioner, two groups of communication protocol circuits are arranged and respectively correspond to the split air conditioner and the multi-split air conditioner. A selectable communication protocol circuit is composed of a transmitting optocoupler and a receiving optocoupler. The on-off of the two groups of communication protocol circuits is controlled by a relay. In this embodiment, when the identity of the master device and the slave device is determined, the device type and the communication rule do not need to be input in advance, but the device is defaulted to be a split air conditioner, the communication type of the split air conditioner is verified within a set time, and if the communication type meets the verification condition, the communication type and the rules of signal sending and receiving are determined. If the master-slave equipment identity authentication method does not meet the authentication condition, the communication protocol circuit is actively switched, the communication type is directly excluded from being determined, and the identity of the master-slave equipment is inverted. Preferably setting a first verification preset value Tt1Is 7s, the second verification preset value Tt2Is 15 s. That is, within 15s after the air conditioner is powered on, the detection tool may actively determine the type and communication mode of the air conditioner and prepare for communication failure detection.
More specifically, since the communication circuit may have a fault, the detection tool may determine the communication modeThe determination is erroneous due to a failure of the communication circuit. To avoid this, referring to fig. 3, which is a flow chart of a preferred embodiment of determining the identity of the master device and the slave device, a preset verification period value T is further set in the second timert3. The step A also comprises the following steps:
step A11, presetting a value T in the verification period of the second timert3In the detection tool, a microprocessor monitors whether a first communication interface receives authentication data sent by the indoor unit, wherein Tt3< Tt1。
Step A12, if the preset value T is in the verification periodt3And if the first communication interface receives the authentication data sent by the indoor unit, the indoor unit can be judged to be the master device, and the outdoor unit can be judged to be the slave device.
And step A13, the detection tool judges the type of the communication protocol according to the authentication data.
If the preset value T is set in the verification periodt3If the identity authentication data sent by the indoor unit is not received, the following steps are executed:
step A14, the microprocessor of the detection tool sends verification data to the outdoor unit through a second communication interface;
step a15, monitoring whether the second communication interface receives the authentication data fed back by the outdoor unit.
Step A16, if the authentication data fed back by the outdoor unit is received, it is determined that the indoor unit is the master device and the outdoor unit is the slave device.
And step A17, the detection tool judges the type of the communication protocol according to the authentication data of the identity.
By the mode, the misjudgment of the model and the equipment identity caused by the fault of the communication circuit can be avoided.
More specifically, if it is determined that the indoor unit is the master device and the outdoor unit is the slave device according to the authentication data received by the first communication interface, that is, the air conditioner is a split air conditioner with a large probability, the fault diagnosis includes:
the microprocessor of the detection tool will be driven byThe command data received by the first communication interface is forwarded to the outdoor unit through the second communication interface, and if the command data is in the first effective preset value T1And if the response data fed back by the outdoor unit is not received, judging that the outdoor unit is in failure, and displaying a corresponding failure code by the detection tool. If at the first valid preset value T1And if response data fed back outdoors are received, judging that the communication is normal, and displaying a corresponding communication code by the detection tool.
Correspondingly, if the indoor unit is judged to be the main device and the outdoor unit is judged to be the slave device according to the authentication data received by the second communication interface, the fault diagnosis specifically comprises the following steps:
and the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface. If at the second valid preset value T2Response data fed back by the slave equipment is internally received, and the preset time T of the fault is reached in the timings1And then displaying the communication code of the communication fault of the indoor unit. Preferably, a failure preset time T is sets1Was 1 minute.
If the outdoor unit is judged to be the master equipment, and the indoor unit is judged to be the slave equipment, the fault diagnosis method comprises the following steps:
and the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit.
And step C, if command data sent by the outdoor unit are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors the first effective preset value T of the first communication interface in the first timer1And if the response data fed back by the indoor unit is received, judging that the communication is normal. If the first communication interface is at the first effective preset value T of the first timer1If the response data fed back by the indoor unit is not received, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed.
Step D, if command data sent by the outdoor unit are not received, the microprocessor of the detection tool generates test data and sends the test data to the indoor unit through the first communication interface, and monitors the first communication interfaceAt a first valid preset value T of a first timer1Whether response data fed back by the indoor unit is received. If at the first valid preset value T1And if response data fed back by the indoor unit is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the outdoor unit communication fault.
In order to improve the accuracy of diagnosing the fault of the inverter air conditioner, in step C, a first effective preset value T1Comprises at least one first preset period Tp1Detecting the microprocessor of the tool in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And if the response data fed back by the indoor unit are not received, judging that the communication fault of the indoor unit occurs. And command data are transmitted for many times in a plurality of preset periods, so that misjudgment can be effectively avoided, and the fault diagnosis accuracy is improved.
More preferably, in step C, the first valid preset value T is1Comprises four first preset periods Tp1. Four predetermined periods Tp1Is less than a first valid preset value T1. Detecting the microprocessor of the tool in each first preset period Tp1Forwarding the command data to the indoor unit once and monitoring the first communication interface at each first preset period Tp1Whether response data fed back by the indoor unit is received. If any one of the first preset periods Tp1And if response data fed back by the indoor unit are received, stopping forwarding the command data. The first effective preset value T is1Divided into a plurality of preset periods T with short durationp1And the command data is stopped being forwarded after the response data fed back by the indoor unit is received, so that the diagnosis period can be effectively shortened, and the response speed of the detection tool is improved. And if the response data are not received, judging that the communication of the indoor unit fails. In order to determine whether each part of the outdoor unit is normal, when the communication fault of the indoor unit is determined, the microprocessor of the detection tool outputs a starting control signal to the outdoor unit through the second communication interface, wherein the starting control signal comprises control parameters. OutdoorsThe machine works according to the control parameters after receiving the starting control signal, and feeds back parameters such as outdoor environment temperature, outdoor condenser coil temperature, outdoor fan rotating speed, compressor actual operating frequency and the like to the detection tool. Wherein, if coil pipe temperature, ambient temperature etc. surpass preset numerical value interval, detect the frock and can also directly show sensor mistake. Preferably, the starting control signal controls the outdoor unit to work for 1 minute so as to ensure that the acquired data is accurate.
Similarly, in step D, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, and determines whether the indoor unit executes an action corresponding to the setting command signal. If the indoor unit does not respond, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed. More specifically, in step D, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and sets a second preset period T for each set timep2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, judging that the indoor unit has communication faults, and displaying communication codes of the indoor unit communication faults; t isp2> Tp1. One optional set of parameters is, set Tp10.5 second, Tp2Is 1 second.
According to the air conditioner fault diagnosis method disclosed by the invention, when the air conditioner has a communication fault code, the fault point can be automatically judged by the method, and a maintenance worker does not need to replace a standby circuit board with a similar communication interface to determine the fault point. Meanwhile, the diagnosis method can automatically detect, identify and determine the master-slave identities of the indoor unit and the outdoor unit in communication, so that the diagnosis method can be applied to various machine types and has the advantages of good universality and high intelligent degree.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A fault diagnosis method for a variable frequency air conditioner is characterized by comprising the following steps: the method comprises the following steps:
the indoor unit is powered on and the relay is closed, and the air conditioner is powered on;
the detection tool detects and determines one of the indoor unit and the outdoor unit as a main device and the other one as a slave device;
if the detection tool receives command data sent by the master device, the received command data are forwarded to the slave device, meanwhile, a first timer in the detection tool starts timing, and if the first timer is at a first effective preset value T of the first timer1If the response data fed back by the slave equipment is not received, the communication fault of the slave equipment is judged; if at the first valid preset value T of the first timer1If response data fed back by the slave equipment is received, judging that the communication is normal;
if the detection tool does not receive command data sent by the master equipment, sending test data to the slave equipment, detecting a first timer in the tool to start timing, and if the first timer is at a second effective preset value T of the first timer2If response data fed back by the slave equipment is received, judging that the communication fault of the master equipment is generated;
wherein, when detecting the master slaver identity that the frock detected and confirmed indoor set and off-premises station includes:
when the air conditioner is electrified, a second timer in the detection tool starts timing:
A. if the first verification preset value T of the second timer is reachedt1If the detection tool receives the authentication data sent by the indoor unit or the authentication data sent by the outdoor unit, the indoor unit is judged to be the main device, the outdoor unit is judged to be the slave device, and the detection tool judges that the indoor unit is the main device and the outdoor unit is the slave device according to the authentication dataJudging the type of a communication protocol;
B. if the second verification preset value T of the second timer is reachedt2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the indoor unit is judged to be the slave unit, the outdoor unit is judged to be the master unit, and T ist2 > Tt1。
2. The inverter air conditioner fault diagnosis method according to claim 1, wherein:
the step A comprises the following steps:
presetting a value T in the verification period of the second timert3In the detection tool, a microprocessor monitors whether a first communication interface receives authentication data sent by an indoor unit, wherein T ist3< Tt1：
If the preset value T is set in the verification periodt3If the authentication data sent by the indoor unit is received, the indoor unit is judged to be a master device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
if the preset value T is set in the verification periodt3If the identity verification data fed back by the outdoor unit is received, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the identity verification data.
3. The inverter air conditioner fault diagnosis method according to claim 2, wherein:
if the indoor unit is judged to be the main equipment and the outdoor unit is judged to be the slave equipment according to the authentication data received by the first communication interface, the fault diagnosis comprises the following steps:
the microprocessor of the detection tool forwards the command data received from the first communication interface to the outdoor unit through the second communication interface, if the command data is in the outdoor unitFirst effective preset value T1If response data fed back by the outdoor unit are not received, the outdoor unit is judged to be in fault, and the detection tool displays a corresponding fault code;
if at the first valid preset value T1And if response data fed back outdoors are received, judging that the communication is normal, and displaying a corresponding communication code by the detection tool.
4. The inverter air conditioner fault diagnosis method according to claim 3, wherein:
if the indoor unit is judged to be the main equipment and the outdoor unit is judged to be the slave equipment according to the authentication data received by the second communication interface, the fault diagnosis comprises the following steps:
the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface, and if the test data is at a second effective preset value T2If response data fed back by the outdoor unit is received, the preset time T of the fault is reached in timings1And displaying the communication code of the communication fault of the indoor unit.
5. The inverter air conditioner fault diagnosis method according to any one of claims 1 to 4, wherein:
if the outdoor unit is judged to be the master device, and the indoor unit is judged to be the slave device, the fault diagnosis comprises the following steps:
the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit:
C. if the command data are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors a first effective preset value T of the first communication interface in the first timer1Whether response data fed back by the indoor unit is received or not is judged, if the response data are received, the communication is judged to be normal, if the response data are not received, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed;
D. if the command data is not received, the microprocessor of the detection tool generates test data, sends the test data to the indoor unit through the first communication interface, and monitors the second communication interfaceA communication interface at a first effective preset value T of a first timer1And if the response data is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the communication fault of the outdoor unit.
6. The inverter air conditioner fault diagnosis method according to claim 5, wherein:
in step C, the first effective preset value T1Comprises at least one first preset period Tp1Detecting the microprocessor of the tool in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And if the response data fed back by the indoor unit are not received, judging that the communication fault of the indoor unit occurs.
7. The inverter air conditioner fault diagnosis method according to claim 6, wherein:
in step C, the first effective preset value T1Comprises four first preset periods Tp1Four predetermined periods Tp1Is less than a first valid preset value T1(ii) a Detecting the microprocessor of the tool in each first preset period Tp1Forwarding the command data to the indoor unit once and monitoring the first communication interface at each first preset period Tp1Whether response data fed back by the indoor unit is received; if any one of the first preset periods Tp1If response data fed back by the indoor unit are received, command data are stopped being forwarded; if the response data are not received, the communication fault of the indoor unit is judged, and meanwhile, the microprocessor of the detection tool outputs a starting control signal to the outdoor unit through the second communication interface to drive the outdoor unit to start and keep a working state.
8. The inverter air conditioner fault diagnosis method according to claim 7, wherein:
in step D, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, whether the indoor unit executes the action corresponding to the setting command signal is judged, if the indoor unit does not respond, the communication fault of the indoor unit is judged, and a communication code of the communication fault of the indoor unit is displayed.
9. The inverter air conditioner fault diagnosis method according to claim 8, wherein:
in step D, if response data fed back by the indoor unit are not received, the microprocessor of the detection tool generates a set command signal and sets the set command signal in each second preset period Tp2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, judging that the indoor unit has communication faults, and displaying communication codes of the indoor unit communication faults; t isp2> Tp1。
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